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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd24998e24cdc1c2157a8a3d7930ec07d069e9746abd6a8b73f9aafe53bd59444' 
  AND token = '+O6F7LvYSULbIcHNW5x44Tj3uKJrEAHo+O67gWp67QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}